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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 1: Geometric Organic Structures on Surfaces

SYOH 1.2: Vortrag

Donnerstag, 11. März 2004, 14:15–14:30, H37

Growth of perylene films on Cu(110) — •Kathrin Hänel, Sandra Söhnchen, Thomas Strunskus, Gregor Witte, Alexander Birkner, and Christof Wöll — Lehrstuhl für Physikalische Chemie I, Ruhr Universität Bochum, Universitätstr. 150, 44780 Bochum

Organic semiconductors such as polycyclic hydrocarbons have attracted a considerable amount of attention because of their promising potential for electronic and optoelectronic devices. Of particular interest for the fabrication of such devices is the molecular microstructure in heterostructures of thin organic films deposited on inorganic substrates. Here we present a comprehensive study of perylene (C₂₀H₁₂) films grown under UHV conditions on Cu(110). The growth and structure of the films were characterized by means of STM, LEED, HAS, TDS, XPS, NEXAFS. While the perylene molecules form an ordered monolayer with an almost planar orientation, they continue to grow in an upright orientation without a preferential azimuthal ordering. The multilayer films reveal a pronounced tendency for dewetting leading to the formation of descrete islands. The terrace structure of such islands could be imaged by non contact AFM measurements under ambient condition and reveals the presence of molecular steps.